971
FNCA52 TJSJ 040730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST TUE AUG 4 2026
DISCUSSION
CRITICALLY DRY FUELS PERSIST ACROSS SOUTHERN PUERTO RICO AND ST.
CROIX, WITH KEETCH-BYRAM DROUGHT INDEX (KBDI) VALUES REMAINING
WELL ABOVE THE CRITICAL THRESHOLD. LOCAL WIND SPEEDS NEAR OR
ABOVE THRESHOLD VALUES WHICH COULD PROMOTE THE RAPID SPREAD OF
ANY FIRE THAT DEVELOPS. EAST-NORTHEAST STEERING FLOW CAN RESULT
IN DRIER AIR MOVING OVER SOUTHERN SECTORS OF PR, HOWEVER
AFTERNOON CONVECTION IS ALSO POSSIBLE OVER INTERIOR TO
WEST-SOUTHWEST PR WHICH COULD PROVIDE RELIEF AND DECREASE THE
FIRE WEATHER RISK. FIRE WEATHER CONDITIONS WILL CONTINUE TO BE
MONITORED CLOSELY. RESIDENTS AND VISITORS SHOULD AVOID OUTDOOR
BURNING AND EXERCISE CAUTION WITH ACTIVITIES THAT COULD GENERATE
SPARKS OR OPEN FLAMES, ESPECIALLY ACROSS AREAS WITH CRITICALLY
DRY VEGETATION.
PRZ014-042000-
SOUTHEAST COASTAL PLAINS-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 20
TEMP (24H TREND) 91 (0) 73 (-3) 92
RH % (24H TREND) 52 (-1) 91 (+2) 48
WIND 20FT/EARLY(MPH) E 16 NE 13 E 16
WIND 20FT/LATE(MPH) E 20 NE 9 SE 16
MIXING HGT(FT-AGL/MSL)5340 5480
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 58740 65760
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-042000-
SOUTHERN HILLS-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 60 50 20
TEMP (24H TREND) 89 (+2) 70 (-3) 89
RH % (24H TREND) 61 (0) 98 (+6) 60
WIND 20FT/EARLY(MPH) E 11 NE 11 E 11
WIND 20FT/LATE(MPH) E 14 NE 10 SE 12
MIXING HGT(FT-AGL/MSL)5990 5990
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 59900 65890
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-042000-
NORTH COASTAL PLAINS-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 89 (-2) 73 (-3) 92
RH % (24H TREND) 65 (+2) 99 (+5) 60
WIND 20FT/EARLY(MPH) E 13 E 14 E 12
WIND 20FT/LATE(MPH) NE 17 E 13 E 19
MIXING HGT(FT-AGL/MSL)4780 5540
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 66920 66480
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-042000-
NORTHERN HILLS-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 30 60
TEMP (24H TREND) 89 (0) 71 (-2) 89
RH % (24H TREND) 69 (+5) 99 (+1) 65
WIND 20FT/EARLY(MPH) E 12 E 13 E 11
WIND 20FT/LATE(MPH) NE 14 E 11 E 16
MIXING HGT(FT-AGL/MSL)5400 5990
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 59400 53910
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-042000-
WEST COAST-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 40 50
TEMP (24H TREND) 93 (+1) 72 (-1) 93
RH % (24H TREND) 61 (0) 99 (+4) 59
WIND 20FT/EARLY(MPH) E 9 E 14 E 11
WIND 20FT/LATE(MPH) SE 12 E 13 E 12
MIXING HGT(FT-AGL/MSL)4560 5050
TRANSPORT WND (MPH) E 6 SE 8
VENT RATE (KT-FT) 22800 35350
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-042000-
EASTERN INTERIOR-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 89 (0) 72 (-3) 91
RH % (24H TREND) 61 (+1) 98 (+4) 58
WIND 20FT/EARLY(MPH) E 11 E 11 E 11
WIND 20FT/LATE(MPH) E 13 E 10 E 13
MIXING HGT(FT-AGL/MSL)6630 6900
TRANSPORT WND (MPH) E 14 SE 13
VENT RATE (KT-FT) 79560 75900
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-042000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40
TEMP (24H TREND) 85 (+3) 69 (-4) 86
RH % (24H TREND) 69 (-3) 99 (+4) 64
WIND 20FT/EARLY(MPH) E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 11 E 8 SE 11
MIXING HGT(FT-AGL/MSL)4730 4950
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 56760 54450
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-042000-
CENTRAL MOUNTAIN RANGE-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 50 50
TEMP (24H TREND) 87 (+3) 67 (-3) 87
RH % (24H TREND) 69 (+1) 100 (+4) 69
WIND 20FT/EARLY(MPH) E 9 E 11 E 8
WIND 20FT/LATE(MPH) E 11 E 10 SE 10
MIXING HGT(FT-AGL/MSL)6620 6290
TRANSPORT WND (MPH) E 10 E 9
VENT RATE (KT-FT) 59580 50320
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-042000-
CAYEY MOUNTAIN RANGE-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30
TEMP (24H TREND) 85 (+1) 69 (-4) 86
RH % (24H TREND) 68 (0) 100 (+2) 65
WIND 20FT/EARLY(MPH) E 10 NE 10 E 10
WIND 20FT/LATE(MPH) E 12 NE 8 SE 11
MIXING HGT(FT-AGL/MSL)5850 5940
TRANSPORT WND (MPH) E 15 E 13
VENT RATE (KT-FT) 76050 65340
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-042000-
VIEQUES-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 20
TEMP (24H TREND) 89 (0) 77 (-3) 91
RH % (24H TREND) 62 (+1) 88 (0) 56
WIND 20FT/EARLY(MPH) E 12 E 13 E 12
WIND 20FT/LATE(MPH) E 12 E 13 E 12
MIXING HGT(FT-AGL/MSL)3260 3340
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 45640 43420
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-042000-
CULEBRA-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 30
TEMP (24H TREND) 90 (+1) 78 (-2) 92
RH % (24H TREND) 63 (-3) 89 (0) 58
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) E 12 E 12 E 12
MIXING HGT(FT-AGL/MSL)3000 3390
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 42000 44070
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-042000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 10
TEMP (24H TREND) 92 (+1) 73 (-2) 93
RH % (24H TREND) 55 (-1) 96 (+10) 50
WIND 20FT/EARLY(MPH) E 14 E 12 E 16
WIND 20FT/LATE(MPH) E 16 NE 12 SE 18
MIXING HGT(FT-AGL/MSL)4430 5310
TRANSPORT WND (MPH) E 9 E 14
VENT RATE (KT-FT) 35440 63720
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-042000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 20
TEMP (24H TREND) 88 (+1) 78 (-2) 90
RH % (24H TREND) 65 (-2) 90 (+1) 59
WIND 20FT/EARLY(MPH) E 13 E 13 E 13
WIND 20FT/LATE(MPH) E 12 E 13 E 13
MIXING HGT(FT-AGL/MSL)3120 3270
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 43680 42510
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-042000-
ST CROIX-
330 AM AST TUE AUG 4 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 20
TEMP (24H TREND) 88 (0) 78 (-2) 90
RH % (24H TREND) 66 (0) 91 (+1) 60
WIND 20FT/EARLY(MPH) E 13 E 12 E 12
WIND 20FT/LATE(MPH) E 13 E 12 E 12
MIXING HGT(FT-AGL/MSL)4420 4850
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 61880 63050
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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